CN108017379A - A kind of aluminum oxide lightweight thermal insulation brick and preparation method thereof - Google Patents
A kind of aluminum oxide lightweight thermal insulation brick and preparation method thereof Download PDFInfo
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- CN108017379A CN108017379A CN201711078161.2A CN201711078161A CN108017379A CN 108017379 A CN108017379 A CN 108017379A CN 201711078161 A CN201711078161 A CN 201711078161A CN 108017379 A CN108017379 A CN 108017379A
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Abstract
The invention discloses a kind of preparation method of aluminum oxide lightweight thermal insulation brick, including using aluminum oxide fine powder, plate diamond spar, white fused alumina fine powder, α Al2O3Micro mist, kaolin, ρ Al2O3Micro mist and " three stone " are raw material, and by adding sintering aid, Ludox, gel powder, water, water-reducing agent, pore creating material and foams mix, finally heated calcining is made.Meanwhile the invention discloses aluminum oxide lightweight thermal insulation brick prepared by the above method.The present invention has the advantages that curing rate is fast, technique is simple, environmental-friendly and with short production cycle；Prepared aluminum oxide lightweight thermal insulation brick thermal conductivity is low, refractoriness under load is high, good thermal shock stability and heating permanent line change are small.
Description
Technical field
The invention belongs to lightweight thermal insulation brick technical field, and in particular to a kind of aluminum oxide lightweight thermal insulation brick and its preparation side
Method.
Background technology
With expanding economy, the consumption of the energy is growing day by day, energy-saving to become question of common concern.Various industry
The heat loss of kiln should not be underestimated, and Industrial Stoves generally use light thermal-shield refractory material builds kiln by laying bricks or stones as insulating layer, so that
Heat consumption is reduced, increases heat storage capacity.Aluminum oxide light-weight brick is the refractory material that a kind of density is small, intensity is high, thermal conductivity is low.With
Common heat-barrier material is compared, and has the characteristics that refractoriness under load is high, compressive resistance is high, the permanent Linear change rate of heating is low；With cause
Close refractory brick, which is compared, has the characteristics such as bulk density is low, good heat insulating, thermal capacity are low, is the preferable inner lining structure of high temperature kiln
Material.
The preparation method of aluminum oxide light-weight brick is very much, mainly there is addition pore creating material method, foam method, gel injection-moulding method etc..
It is that pore former is added in ceramic powder to add pore creating material method, burns mistake in sintering process using pore former and forms hole to make
Standby porous ceramics.Foaming is mainly introduced into gas into slurry by the mode such as physical agitation or addition foaming agent first, it
For ceramic slurry by curing and being dried to obtain ceramic green, last green compact can obtain foamed ceramics by burning till afterwards.Such as " one kind
The patented technology of alumina light-weight brick and preparation method thereof " (CN101708997A), this method is with the Al of 50 ~ 80wt%2O3Carefully
α-the Al of powder, 15 ~ 30wt%2O3α-the Al of fine powder, 5 ~ 20wt%2O3ρ-the Al of micro mist and 5 ~ 20wt%2O3Micro mist is raw material, additional
The sintering aid of 0.1 ~ 1wt%, the water of 30 ~ 50wt%, the SiO of the water-reducing agent of 0.1 ~ 1wt% and 0.1 ~ 2wt%2, mix 3 ~ 5 minutes, then
The foaming agent of additional 0.2 ~ 0.4wt%, is uniformly mixed, moulding by casting, is burnt till after dry under conditions of 1450 ~ 1700 DEG C, keeps the temperature
3 ~ 5 it is small when.Though the technology has the advantages that certain, also have the following disadvantages：(1) amount of water is excessive, cause demoulding time compared with
Long, drying time is longer, is unfavorable for industrially promoting；(2) addition of micro mist excessively causes sample to be shunk in sintering process
It is excessive, influence properties of sample；(3) plate diamond spar and fused white corundum are not introduced into, belongs to microcellular structure again in addition, sample may be caused
The possible thermal shock resistance of product is bad.
Gel injection-moulding method is that organic monomer, crosslinking agent, catalyst, initiator etc. are added in slurry, then ceramics
Slurry is injected into mould, and the in-situ solidifying shaping due to monomer generation polymerisation of last slurry, obtains the equal of complicated shape
Even base substrate., should such as the patented technology of " one kind prepares alumina porous ceramic using gel-foaming " (CN102432332 A)
Though it is certain that technology uses the method for foam method attached gel casting to have the advantages that, also have the following disadvantages：(1) due to
Organic monomer, initiator and the catalyst used has certain toxicity, unfavorable to health and environment；(2) use
Gel rubber system, improves cost, limits promoting the use of for product.
The content of the invention
Goal of the invention：Present invention aims in view of the deficiencies of the prior art, there is provided a kind of curing rate is fast, technique is simple
The preparation method of single, environmental-friendly and with short production cycle aluminum oxide lightweight thermal insulation brick.
Another object of the present invention is to provide with this method prepare thermal conductivity it is low, refractoriness under load is high, thermal shock is steady
Qualitative good and heating permanent line changes small aluminum oxide lightweight thermal insulation brick.
Technical solution：In order to reach foregoing invention purpose, the present invention is specifically achieved like this：A kind of aluminium oxide is light
The preparation method of matter insulating brick, comprises the following steps：
（1）Using the granularity of 20 ~ 40wt% as the calcined alumina fine powder of 0.044 ~ 0.147mm, 15 ~ 30wt% granularity for 0.074
The plate diamond spar of ~ 0.147mm, the granularity of 15 ~ 30wt% are that the white fused alumina fine powder of 0.074 ~ 0.147mm, the granularity of 5 ~ 15wt% are small
In 5 μm of α-Al2O3Micro mist, the granularity that the granularity of 0 ~ 10wt% is the kaolin of 0.074 ~ 0.147mm, 5 ~ 10wt% are less than 5 μm
ρ-Al2O3" three stone " of micro mist and 0 ~ 10wt% are raw material, are pre-mixed 3 ~ 5 minutes, and premix is made；
（2）The sintering aid of the additional 0.1 ~ 1wt% of premix, Ludox, the gel of 0 ~ 15wt% of 0 ~ 30wt% into premix
The water-reducing agent of powder, the water of 20 ~ 35wt% and 0.1 ~ 0.8wt%, mixes 5 ~ 10 minutes, obtains mixture；
（3）Pore creating material and foam are added into mixture, is mixed 5 ~ 10 minutes, moulding by casting, when curing 1 ~ 3 is small, is cured
Base substrate afterwards；Wherein：The addition of foam is 0.5 ~ 1L in per Kg mixtures, and the addition of pore creating material is 2 ~ 15wt%；
（4）Base substrate after curing is warming up to 1400 ~ 1800 DEG C, 3 ~ 9h is kept the temperature, up to aluminum oxide lightweight thermal insulation brick.
Wherein, the kaolinic Al2O3>=33.0%, Fe2O3≤ 1.08%, R2O≤1.7%。
Wherein, described " three stone " is one or both of kyanite, sillimanite and andalusite, its granularity is less than
0.178mm。
Wherein, the sintering aid is TiO2Micro mist, MgO micro mists, Cr2O3Micro mist, MgF2And AlF3One kind in micro mist or
Two kinds.
Wherein, the water-reducing agent subtracts for polycarboxylic acids dehydragent, inorganic salts water-reducing agent, sulfonic acid based water reducer and naphthalene system
One or both of aqua.
Wherein, the pore creating material is one or both of rice husk, starch, sawdust and dusty yeast, its granularity is less than
0.3mm。
Aluminum oxide lightweight thermal insulation brick described herein, the preparation method by above-mentioned aluminum oxide lightweight thermal insulation brick are made
It is standby.
Beneficial effect：The present invention is compared with conventional art, and there are advantages below and effect：
1st, curing rate is fast, technique is simple, environmental-friendly and aluminum oxide lightweight thermal insulation brick with short production cycle preparation method；
With this method prepare aluminum oxide lightweight thermal insulation brick thermal conductivity it is low, refractoriness under load is high, good thermal shock stability and heating forever
Long line change is small；
2nd, the bulk density of the aluminum oxide light-weight brick obtained by the present invention is 0.9 ~ 1.3g/cm3, thermal conductivity factor for 0.36 ~
0.6w/m.k, compressive resistance reach 3.50 ~ 8.2Mpa, and linear shrinkage is 1 ~ 5%, and heating permanent line, which becomes, turns to -0.4 ~ -1.6%, loading
Softening temperature is 1500 ~ 1600 DEG C, and thermal shock resistance number is 15 ~ 25 times；
3rd, the present invention has the advantages that curing rate is fast, technique is simple, environmental-friendly and with short production cycle；Prepared aluminium oxide
Matter lightweight thermal insulation brick thermal conductivity is low, refractoriness under load is high, good thermal shock stability and heating permanent line change are small.
Embodiment
Embodiment 1：
It is 0.074 ~ 0.147mm's by the calcined alumina fine powder of 0.044 ~ 0.147mm, the granularity of 30wt% of the granularity of 20wt%
Plate diamond spar, the granularity of 15wt% are α-Al of the granularity less than 5 μm of the white fused alumina fine powder of 0.074 ~ 0.147mm, 15wt%2O3It is micro-
Powder, the granularity of 5wt% are ρ-Al of the granularity less than 5 μm of the kaolin of 0.074 ~ 0.147mm, 10wt%2O3Micro mist and 5wt%'s
" three stone " is raw material, is pre-mixed 3 ~ 5 minutes, and premix is made；Into premix the sintering aid of the additional premix 0.5wt%,
The Ludox of 15wt%, the gel powder of 7wt%, the water-reducing agent of the water of 25wt% and 0.5wt%, mix 5 ~ 10 minutes, obtain mixture；
Pore creating material and foam are added into mixture, is mixed 5 ~ 10 minutes, moulding by casting, when curing 1 ~ 3 is small, the base after being cured
Body；Wherein：The addition of foam is 0.8L in per Kg mixtures, and the addition of pore creating material is 10wt%；By the base substrate liter after curing
Temperature keeps the temperature 3 ~ 9h, up to aluminum oxide lightweight thermal insulation brick to 1400 ~ 1800 DEG C.
Wherein, described " three stone " is one or both of kyanite, sillimanite and andalusite, its granularity is less than
0.178mm；The sintering aid is TiO2Micro mist, MgO micro mists, Cr2O3Micro mist, MgF2And AlF3One or both of micro mist；
The water-reducing agent is one kind in polycarboxylic acids dehydragent, inorganic salts water-reducing agent, sulfonic acid based water reducer and naphthalene water reducer
Or two kinds；The pore creating material is one or both of rice husk, starch, sawdust and dusty yeast, its granularity is less than 0.3mm.
Embodiment 2：
It is 0.074 ~ 0.147mm's by the calcined alumina fine powder of 0.044 ~ 0.147mm, the granularity of 25wt% of the granularity of 25wt%
Plate diamond spar, the granularity of 30wt% are α-Al of the granularity less than 5 μm of the white fused alumina fine powder of 0.074 ~ 0.147mm, 5wt%2O3It is micro-
Powder, the granularity of 5wt% are ρ-Al of the granularity less than 5 μm of the kaolin of 0.074 ~ 0.147mm, 5wt%2O3Micro mist and 5wt%'s
" three stone " is raw material, is pre-mixed 3 ~ 5 minutes, and premix is made；Into premix the sintering aid of the additional premix 0.1wt%,
The water-reducing agent of the Ludox of 10wt%, the water of 35wt% and 0.8wt%, mixes 5 ~ 10 minutes, obtains mixture；Add into mixture
Enter pore creating material and foam, mix 5 ~ 10 minutes, moulding by casting, when curing 1 ~ 3 is small, the base substrate after being cured；Wherein：Mixed per Kg
The addition for closing foam in material is 1L, and the addition of pore creating material is 2wt%；Base substrate after curing is warming up to 1400 ~ 1800 DEG C,
3 ~ 9h is kept the temperature, up to aluminum oxide lightweight thermal insulation brick.
Wherein, described " three stone " is one or both of kyanite, sillimanite and andalusite, its granularity is less than
0.178mm；The sintering aid is TiO2Micro mist, MgO micro mists, Cr2O3Micro mist, MgF2And AlF3One or both of micro mist；
The water-reducing agent is one kind in polycarboxylic acids dehydragent, inorganic salts water-reducing agent, sulfonic acid based water reducer and naphthalene water reducer
Or two kinds；The pore creating material is one or both of rice husk, starch, sawdust and dusty yeast, its granularity is less than 0.3mm.
Embodiment 3：
It is 0.074 ~ 0.147mm's by the calcined alumina fine powder of 0.044 ~ 0.147mm, the granularity of 15wt% of the granularity of 30wt%
Plate diamond spar, the granularity of 25wt% are α-Al of the granularity less than 5 μm of the white fused alumina fine powder of 0.074 ~ 0.147mm, 10wt%2O3It is micro-
Powder, the granularity of 5wt% are ρ-Al of the granularity less than 5 μm of the kaolin of 0.074 ~ 0.147mm, 10wt%2O3Micro mist and 5wt%'s
" three stone " is raw material, is pre-mixed 3 ~ 5 minutes, and premix is made；Into premix the sintering aid of the additional premix 1wt%,
The Ludox of 20wt%, the gel powder of 15wt%, the water-reducing agent of the water of 30wt% and 0.6wt%, mix 5 ~ 10 minutes, are mixed
Material；Pore creating material and foam are added into mixture, is mixed 5 ~ 10 minutes, moulding by casting, when curing 1 ~ 3 is small, after being cured
Base substrate；Wherein：The addition of foam is 0.5L in per Kg mixtures, and the addition of pore creating material is 15wt%；By the base substrate after curing
1400 ~ 1800 DEG C are warming up to, 3 ~ 9h is kept the temperature, up to aluminum oxide lightweight thermal insulation brick.
Wherein, described " three stone " is one or both of kyanite, sillimanite and andalusite, its granularity is less than
0.178mm；The sintering aid is TiO2Micro mist, MgO micro mists, Cr2O3Micro mist, MgF2And AlF3One or both of micro mist；
The water-reducing agent is one kind in polycarboxylic acids dehydragent, inorganic salts water-reducing agent, sulfonic acid based water reducer and naphthalene water reducer
Or two kinds；The pore creating material is one or both of rice husk, starch, sawdust and dusty yeast, its granularity is less than 0.3mm.
Embodiment 4：
It is 0.074 ~ 0.147mm's by the calcined alumina fine powder of 0.044 ~ 0.147mm, the granularity of 20wt% of the granularity of 35wt%
Plate diamond spar, the granularity of 20wt% are α-Al of the granularity less than 5 μm of the white fused alumina fine powder of 0.074 ~ 0.147mm, 10wt%2O3It is micro-
Powder, the granularity of 5wt% are less than 5 μm of ρ-Al2O3" three stone " of micro mist and 10wt% are raw material, are pre-mixed 3 ~ 5 minutes, and premix is made
Material；The sintering aid of the additional premix 0.3wt%, the Ludox of 25wt%, the gel powder of 10wt%, 25wt% into premix
The water-reducing agent of water and 0.4wt%, mixes 5 ~ 10 minutes, obtains mixture；Addition pore creating material and foam into mixture, mixing 5 ~
10 minutes, moulding by casting, when curing 1 ~ 3 is small, the base substrate after being cured；Wherein：The addition of foam is in per Kg mixtures
0.6L, the addition of pore creating material is 12wt%；Base substrate after curing is warming up to 1400 ~ 1800 DEG C, keeps the temperature 3 ~ 9h, up to aoxidizing
Aluminum lightweight thermal insulation brick.
Wherein, described " three stone " is one or both of kyanite, sillimanite and andalusite, its granularity is less than
0.178mm；The sintering aid is TiO2Micro mist, MgO micro mists, Cr2O3Micro mist, MgF2And AlF3One or both of micro mist；
The water-reducing agent is one kind in polycarboxylic acids dehydragent, inorganic salts water-reducing agent, sulfonic acid based water reducer and naphthalene water reducer
Or two kinds；The pore creating material is one or both of rice husk, starch, sawdust and dusty yeast, its granularity is less than 0.3mm.
Embodiment 5：
It is 0.074 ~ 0.147mm's by the calcined alumina fine powder of 0.044 ~ 0.147mm, the granularity of 15wt% of the granularity of 40wt%
Plate diamond spar, the granularity of 15wt% are α-Al of the granularity less than 5 μm of the white fused alumina fine powder of 0.074 ~ 0.147mm, 15wt%2O3It is micro-
The granularity of powder, the kaolin that the granularity of 5wt% is 0.074 ~ 0.147mm and 10wt% is less than 5 μm of ρ-Al2O3Micro mist premixing 3 ~
5 minutes, premix is made；The sintering aid of the additional premix 0.8wt%, the gel powder of 15wt%, 20wt% into premix
The water-reducing agent of water and 0.1wt%, mixes 5 ~ 10 minutes, obtains mixture；Addition pore creating material and foam into mixture, mixing 5 ~
10 minutes, moulding by casting, when curing 1 ~ 3 is small, the base substrate after being cured；Wherein：The addition of foam is in per Kg mixtures
0.8L, the addition of pore creating material is 8wt%；Base substrate after curing is warming up to 1400 ~ 1800 DEG C, 3 ~ 9h is kept the temperature, up to aluminium oxide
Matter lightweight thermal insulation brick.
Wherein, the sintering aid is TiO2Micro mist, MgO micro mists, Cr2O3Micro mist, MgF2And AlF3One kind in micro mist or
Two kinds；The water-reducing agent is in polycarboxylic acids dehydragent, inorganic salts water-reducing agent, sulfonic acid based water reducer and naphthalene water reducer
It is one or two kinds of；The pore creating material is one or both of rice husk, starch, sawdust and dusty yeast, its granularity is less than
0.3mm。
Claims (7)
1. a kind of preparation method of aluminum oxide lightweight thermal insulation brick, it is characterised in that comprise the following steps：
（1）Using the granularity of 20 ~ 40wt% as the calcined alumina fine powder of 0.044 ~ 0.147mm, 15 ~ 30wt% granularity for 0.074
The plate diamond spar of ~ 0.147mm, the granularity of 15 ~ 30wt% are that the white fused alumina fine powder of 0.074 ~ 0.147mm, the granularity of 5 ~ 15wt% are small
In 5 μm of α-Al2O3Micro mist, the granularity that the granularity of 0 ~ 10wt% is the kaolin of 0.074 ~ 0.147mm, 5 ~ 10wt% are less than 5 μm
ρ-Al2O3" three stone " of micro mist and 0 ~ 10wt% are raw material, are pre-mixed 3 ~ 5 minutes, and premix is made；
（2）The sintering aid of the additional 0.1 ~ 1wt% of premix, Ludox, the gel of 0 ~ 15wt% of 0 ~ 30wt% into premix
The water-reducing agent of powder, the water of 20 ~ 35wt% and 0.1 ~ 0.8wt%, mixes 5 ~ 10 minutes, obtains mixture；
（3）Pore creating material and foam are added into mixture, is mixed 5 ~ 10 minutes, moulding by casting, when curing 1 ~ 3 is small, is cured
Base substrate afterwards；Wherein：The addition of foam is 0.5 ~ 1L in per Kg mixtures, and the addition of pore creating material is 2 ~ 15wt%；
（4）Base substrate after curing is warming up to 1400 ~ 1800 DEG C, 3 ~ 9h is kept the temperature, up to aluminum oxide lightweight thermal insulation brick.
2. the preparation method of aluminum oxide lightweight thermal insulation brick according to claim 1, it is characterised in that described kaolinic
Al2O3>=33.0%, Fe2O3≤ 1.08%, R2O≤1.7%。
3. the preparation method of aluminum oxide lightweight thermal insulation brick according to claim 1, it is characterised in that " three stone " is
One or both of kyanite, sillimanite and andalusite, its granularity are less than 0.178mm.
4. the preparation method of aluminum oxide lightweight thermal insulation brick according to claim 1, it is characterised in that the sintering aid
For TiO2Micro mist, MgO micro mists, Cr2O3Micro mist, MgF2And AlF3One or both of micro mist.
5. the preparation method of aluminum oxide lightweight thermal insulation brick according to claim 1, it is characterised in that the water-reducing agent
For one or both of polycarboxylic acids dehydragent, inorganic salts water-reducing agent, sulfonic acid based water reducer and naphthalene water reducer.
6. the preparation method of aluminum oxide lightweight thermal insulation brick according to claim 1, it is characterised in that the pore creating material
For one or both of rice husk, starch, sawdust and dusty yeast, its granularity is less than 0.3mm.
7. a kind of aluminum oxide lightweight thermal insulation brick, it is characterised in that the aluminum oxide lightweight thermal insulation brick is according to claim 1
Aluminum oxide lightweight thermal insulation brick prepared by the preparation method of aluminum oxide lightweight thermal insulation brick in ~ 6 described in any one.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108585902A (en) * | 2018-07-11 | 2018-09-28 | 合肥铭佑高温技术有限公司 | A kind of reinforcing refractory brick of pressure resistance anticracking |
| CN109437936A (en) * | 2018-12-26 | 2019-03-08 | 武汉如星科技有限公司 | A kind of prefabricated insulating brick of moulding by casting ladle |
| CN109748597A (en) * | 2019-03-20 | 2019-05-14 | 苏州北美国际高级中学 | A kind of presoma method that mutually gelling prepares mullite porous ceramic |
| CN110937882A (en) * | 2019-12-17 | 2020-03-31 | 中国铝业股份有限公司 | Alumina light heat-insulating material and preparation method thereof |
| CN115893996A (en) * | 2023-02-07 | 2023-04-04 | 锦州长城耐火材料有限公司 | Aluminum-chromium composite brick and preparation process thereof |
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| CN103044045A (en) * | 2013-01-17 | 2013-04-17 | 武汉科技大学 | High-strength aluminum oxide light-weight heat insulation brick and preparation method thereof |
| CN103467131A (en) * | 2013-08-30 | 2013-12-25 | 武汉科技大学 | Method for preparing alumina lightweight insulating brick by mixing method |
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| CN102320845A (en) * | 2011-08-12 | 2012-01-18 | 武汉科技大学 | Al2O3-SiO2 tundish permeable brick and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108585902A (en) * | 2018-07-11 | 2018-09-28 | 合肥铭佑高温技术有限公司 | A kind of reinforcing refractory brick of pressure resistance anticracking |
| CN109437936A (en) * | 2018-12-26 | 2019-03-08 | 武汉如星科技有限公司 | A kind of prefabricated insulating brick of moulding by casting ladle |
| CN109437936B (en) * | 2018-12-26 | 2021-11-26 | 武汉如星科技有限公司 | Prefabricated heat insulation brick for casting formed steel ladle |
| CN109748597A (en) * | 2019-03-20 | 2019-05-14 | 苏州北美国际高级中学 | A kind of presoma method that mutually gelling prepares mullite porous ceramic |
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| CN110937882A (en) * | 2019-12-17 | 2020-03-31 | 中国铝业股份有限公司 | Alumina light heat-insulating material and preparation method thereof |
| CN115893996A (en) * | 2023-02-07 | 2023-04-04 | 锦州长城耐火材料有限公司 | Aluminum-chromium composite brick and preparation process thereof |
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